NFS and Samba Mountings
 

I have a 3 tiers solutions; first 2 are on Linux, third on Windows. I have NFS mapping and Samba Mappings on these systems.

Question:

To prevent unmount; I have scheduled 'nfs' and 'smb' to restart every 5 minutes. Is this a good stretegy. How other people work around for such problems.

Could you clarify. Are you talking about the client side? If so automounting using the autofs is useful for linux clients.
With a MS client you can set the mapping to be restored after a boot.

On the server side only root can unmount file systems unless you specify user as an option in fstab.